Refmac by itself should not care about duplicated residue names in the monomer 
library. It takes the last monomer. There should be something on the interface 
preventing this.

Longer than three letters should be available from the next release of ccp4. 
New acedrg and Refmacat should be able to deal with them. Ccp4i2 might not be 
ready.

Regards
Garib


> On 26 Apr 2024, at 11:21, FREITAG-POHL, STEFANIE 
> <stefanie.freitag-p...@durham.ac.uk> wrote:
> 
> Dear all,
> 
> thank you so much for all your suggestions.
> 
> Unfortunately, nothing helped. Whatever 3-letter code I choose Refmac is 
> complaining that there is a clash with an already existing ligand (even DRG, 
> LIG, numbers) and AceDRG in CCP4i2 insists on 3 letters.
> 
> I am not quite sure how to bypass this issue as I think Refmac is also 
> insisting on 3-letters for ligands (???)
> 
> I have not tried Grade yet.
> 
> Any advise much appreciated.
> 
> Best wishes,
> Stefanie
> 
> 
> 
> Dr. Stefanie Freitag-Pohl (she/her)
> Durham University
> Department of Chemistry
> South Road, Durham
> DH1 3LE
> United Kingdom
> 0191 334 2596
> stefanie.freitag-p...@durham.ac.uk <mailto:stefanie.freitag-p...@durham.ac.uk>
> From: CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK 
> <mailto:CCP4BB@JISCMAIL.AC.UK>> on behalf of FREITAG-POHL, STEFANIE 
> <stefanie.freitag-p...@durham.ac.uk 
> <mailto:stefanie.freitag-p...@durham.ac.uk>>
> Sent: 25 April 2024 13:01
> To: CCP4BB@JISCMAIL.AC.UK <mailto:CCP4BB@JISCMAIL.AC.UK> 
> <CCP4BB@JISCMAIL.AC.UK <mailto:CCP4BB@JISCMAIL.AC.UK>>
> Subject: [ccp4bb] add ligand with AceDRG
>  
> [EXTERNAL EMAIL]
> Hi all,
> 
> I have trouble adding a ligand with AceDRG in CCP4i2 into my refinement:
> 
> I put in a smilesstring and the ligand is written ok, but since I can only 
> chose already 'taken' 3-letter-codes the refinement always crashes as there 
> is a clash with existing library entries.
> Is there any way around this? How do I add a novel ligand?
> 
> Thanks so much for your help.
> 
> Best wishes,
> Stefanie
> 
> 
> 
> Dr. Stefanie Freitag-Pohl (she/her)
> Durham University
> Department of Chemistry
> South Road, Durham
> DH1 3LE
> United Kingdom
> 0191 334 2596
> stefanie.freitag-p...@durham.ac.uk <mailto:stefanie.freitag-p...@durham.ac.uk>
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